to.setRealm(from.getRealm());
        to.setService(from.getService());
        to.setLifeTime(from.getLifeTime());
        to.setUserLifeTime(from.getUserLifeTime());

        to.canFallback = from.canFallback;
        to.forceFallback = from.forceFallback;
    }

    /**
     * Set the user name which is used to setup <code>GSSContext</code>. If null